chandra_307 November 2nd, 2005
Credit: NASA/CXC/UCLA/M.Muno et al.
Several of the stars in Westerlund 1 (optical image left) have the mass of about 40 suns, which means that they will race through their evolution and form neutron stars or black holes in a few million years. A search of the cluster with Chandra (X-ray image right) found no evidence of black holes. However, astronomers did find a neutron star (CXO J164710.2-455216). Because extremely massive stars evolve more rapidly than less massive ones, and the progenitor of the neutron star has already exploded as a supernova, it must have had a mass greater than 40 suns. This discovery may severely limit the range of stellar masses that lead to the formation of stellar black holes.
Provider: Chandra X-ray Observatory
Image Source: http://chandra.harvard.edu/photo/2005/wd1/
Curator: Chandra X-ray Observatory, Cambridge, MA, USA
Image Use Policy: http://chandra.harvard.edu/photo/image_use.html
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